From my experience, reputable GUs are indeed willing to put some effort into an offer – but understandably not yet in the "Let's see how the market looks" phase.
That's right, on the one hand: calculating "usable" offers requires intensive use of personnel who cannot be recruited from the intern pool, i.e. whose time also "properly" costs. It doesn't necessarily require a high probability of closing yet, but at least a fair chance. But exactly at this point, you don't know the initial requester well enough yet. And unfortunately, for many "consumers," "obtaining offers" has become a popular sport. That means the provider has to expect that the requester is not ashamed to want offers from ten or even more providers. Logically, this can only be done in this "low-resolution" form of a price per cubic meter for a house on a virtually slab-finished ideal plot. On the other hand, a good provider also produces "quality" and often does not want bargain-hunting customers – or almost worse: customers who, with discount store prices in mind, expect to find one of the premium providers who is only slightly more expensive. As long as it is not clear whether the requester is not such a strange bird, one does not also expend effort to "win" this potential customer. I have always earned best from the
bad deals that I
did not make – I would not see that differently as a house provider.